Trying to get DO-RTM to account for reflection.

I am trying to recreate a study on a Concentrated Solar Power reflector similar to this paper, instead using Direct Ordinates

Here are some images from the paper:


Cleary, this is from an older Ansys. DO doesn't seem to reflect solar energy into a collector in my current Ansys (R20) the way Roseland does on this older Ansys. Also, I have no idea where to put 'reflectivity of collector', 'collector emissivity', and 'receiver absorptivity'.

Thanks you for your help

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